Kuv yuav tau SSXY li cas?
Kuv yuav tau SSXY li cas?

Video: Kuv yuav tau SSXY li cas?

Video: Kuv yuav tau SSXY li cas?
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Ib yam li ntawd, SSX yog xam los ntawm kev ntxiv x lub sij hawm x ces rho tag nrho cov x lub sij hawm tag nrho cov x muab faib los ntawm n. Thaum kawg, SSXY yog xam los ntawm kev ntxiv x lub sij hawm y ces rho tag nrho cov x lub sij hawm tag nrho cov y muab faib los ntawm n.

Hauv qhov no, kuv yuav tau txais SSxx li cas?

Xam qhov nruab nrab ntawm koj qhov sib txawv X. Xam qhov sib txawv ntawm txhua X thiab qhov nruab nrab X. Square qhov sib txawv thiab ntxiv tag nrho. Qhov no yog SSxx ib.

Kuj Paub, koj ua li cas xam SSR hauv kev txheeb cais? Thawj kauj ruam: nrhiav cov seem. Rau txhua tus x-tus nqi hauv cov qauv, suav tus nqi haum lossis kwv yees tus nqi ntawm y, siv ˆyi = ˆβ0 + ˆβ1xi. Tom qab ntawd rho tawm txhua tus nqi tsim nyog los ntawm qhov sib thooj, pom, tus nqi ntawm yi. Squaring thiab summing qhov sib txawv no muab qhov SSR.

Ib yam li ntawd, SSxx yog dab tsi hauv kev txheeb cais?

SSxx ib . qhov twg SSxy yog qhov "sum of squares" rau txhua khub ntawm kev soj ntsuam x thiab y thiab SSxx ib . yog "sum of squares" rau txhua x kev soj ntsuam.

Tus lej ntawm cov seem txhais li cas?

Hauv kev txheeb cais, cov seem seem ntawm squares (RSS), tseem hu ua lub sum ntawm squared cov seem (SSR) lub sum ntawm squared kwv yees ntawm qhov yuam kev (SSE), yog qhov sum ntawm cov squares ntawm cov seem (deviations kwv yees los ntawm qhov tseeb empirical qhov tseem ceeb ntawm cov ntaub ntawv). Ib qho RSS me me qhia txog qhov nruj ntawm tus qauv rau cov ntaub ntawv.

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